Air-, N2-, and O2-broadening and shift coefficients in the nu(3) spectral region of (C-12)H4

Details Air-, N2-, and O2-broadening and shift coefficients in the nu(3) spectral region of (C-12)H4 Air-, N2-, and O2-broadening and shift coefficients in the nu(3) spectral region of (C-12)H4

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jqsrt..50...65b&link_type=abstract

Journal of Quantitative Spectroscopy and Radiative Transfer (ISSN 0022-4073), vol. 50, no. 1, p. 65-89.

Other

22

Absorption Spectra, Electron Transitions, Methane, Pressure Effects, Spectral Line Width, Infrared Spectra, Least Squares Method, Molecular Oscillations, Molecular Rotation, Spectrum Analysis

Scientific paper

Results are presented of an analysis of 29 room-temperature laboratory absorption spectra of a dilute CH4 sample in dry air, N2, and O2 at total pressures ranging from 60 to 550 torr, yielding values of pressure-broadening and pressure-induced-shift coefficients for more than 450 vibration-rotation transitions in the nu(3), nu(2) + nu(4), and 2nu(2)-super-2 bands of (C-12)H4. Comparisons of the present results for the nu(3) and nu(2) + nu(4) bands with previous measurements on other bands and isotopes of CH4 show that, for a given transition, broadening by air and N2 are nearly equal, and broadening by O2 is smaller by less than 10 percent. It is also found that the pressure shift coefficients are more vibrational dependent than the pressure broadening coefficients.

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